Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 70ba7ac95d916112…

MALICIOUS

Office (OLE)

685.0 KB Created: 2020-04-20 14:43:13 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: 9f9b1d5ced42f9fb328082808a9a1868 SHA-1: 76bb8eb63808e2978bc66b6d1b9c78c1662c130b SHA-256: 70ba7ac95d91611296aec897a745ad852ade849a7a0f36edb7e0f328679a985e
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests it is designed to execute automatically upon opening. While the document body is unreadable, the macro sheet structure points to a malicious intent, likely to download and execute a secondary payload or perform other malicious actions.

Heuristics 2

  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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